DS1922L_11 Datasheet, PDF (1/52 Pages) Maxim Integrated Products – Temperature Logger iButton with 8KB Data-Log Memory

19-4990; Rev 10; 4/11
Temperature Logger iButton with 8KB
Data-Log Memory
General Description
The DS1922L/DS1922T temperature logger iButtons^® are
rugged, self-sufficient systems that measure temperature
and record the result in a protected memory section. The
recording is done at a user-defined rate. A total of 8192
8-bit readings or 4096 16-bit readings, taken at equidistant
intervals ranging from 1s to 273hr, can be stored.
Additionally, 512 bytes of SRAM store application-specific
information and 64 bytes store calibration data. A mission
to collect data can be programmed to begin immediately,
after a user-defined delay, or after a temperature alarm.
Access to the memory and control functions can be pass-
word protected. The DS1922L/DS1922T are configured
and communicate with a host-computing device through
the serial 1-Wire^® protocol, which requires only a single
data lead and a ground return. Each DS1922L/DS1922T is
factory lasered with a guaranteed unique 64-bit registration
number that allows for absolute traceability. The durable
stainless-steel package is highly resistant to environmental
hazards such as dirt, moisture, and shock. Accessories
permit the DS1922L/DS1922T to be mounted on almost
any object, including containers, pallets, and bags.
Applications
High-Temperature Logging (Process Monitoring,
Industrial Temperature Monitoring)
Temperature Logging in Cold Chain, Food Safety, Bio
Science, and Pharmaceutical and Medical Products
Features
♦ Automatically Wakes Up, Measures Temperature,
and Stores Values in 8KB of Data-Log Memory in
8-Bit or 16-Bit Format
♦ Digital Thermometer Measures Temperature with
8-Bit (0.5°C) or 11-Bit (0.0625°C) Resolution
♦ Accuracy of ±0.5°C from -10°C to +65°C
(DS1922L), ± 0.5°C from +20°C to +75°C
(DS1922T), with Software Corrections
♦ Water Resistant or Waterproof if Placed Inside
DS9107 iButton Capsule (Exceeds Water
Resistant 3 ATM Requirements)
♦ Sampling Rate from 1s Up to 273hr
♦ Programmable High and Low Trip Points for
Temperature Alarms
♦ Programmable Recording Start Delay After Elapsed
Time or Upon a Temperature Alarm Trip Point
♦ Quick Access to Alarmed Devices Through 1-Wire
Conditional Search Function
♦ 512 Bytes of General-Purpose Memory Plus 64
Bytes of Calibration Memory
♦ Two-Level Password Protection of All Memory
and Configuration Registers
♦ Communicates to Host with a Single Digital Signal
Up to 15.4kbps at Standard Speed or Up to
125kbps in Overdrive Mode Using 1-Wire Protocol
♦ Operating Temperature Range: DS1922L: -40°C to
+85°C; DS1922T: 0°C to +125°C
Common iButton Features
♦ Digital Identification and Information by
Momentary Contact
♦ Unique Factory-Lasered 64-Bit Registration Number
Ensures Error-Free Device Selection and Absolute
Traceability Because No Two Parts Are Alike
♦ Built-In Multidrop Controller for 1-Wire Net
♦ Chip-Based Data Carrier Compactly Stores Information
♦ Data Can Be Accessed While Affixed to Object
♦ Button Shape is Self-Aligning with Cup-Shaped
Probes
♦ Durable Stainless-Steel Case Engraved with
Registration Number Withstands Harsh Environments
♦ Easily Affixed with Self-Stick Adhesive Backing,
Latched by Its Flange, or Locked with a Ring
Pressed Onto Its Rim
♦ Presence Detector Acknowledges When Reader
First Applies Voltage
♦ Meets UL 913, 5th Ed., Rev. 1997-02-24; Intrinsically
Safe Apparatus: Approved Under Entity Concept
for Use in Class I, Division 1, Group A, B, C, and D
Locations
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
DS1922L-F5#
-40°C to +85°C
F5 iButton
DS1922T-F5#
0°C to +125°C
F5 iButton
#Denotes a RoHS-compliant device that may include lead(Pb)
that is exempt under the RoHS requirements.
Examples of Accessories
PART
DS9096P
DS9101
DS9093RA
DS9093A
DS9092
ACCESSORY
Self-Stick Adhesive Pad
Multipurpose Clip
Mounting Lock Ring
Snap-in FOB
iButton Probe
Pin Configuration appears at end of data sheet.
iButton and 1-Wire are registered trademarks of Maxim Integrated Products, Inc.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.